The state of Iowa is divided into five numbering plan areas (NPAs) in the North American Numbering Plan (NANP), with one area code assigned to each. None of the NPAs are expected to experience central office code exhaustion in the immediate future. It is one of the few states that has not implemented an overlay complex in any of its areas.
Areacode Year ParentNPA Numbering plan area 319 1947 – Cedar Rapids, Waterloo, Iowa City, and Cedar Falls 515 1947 – Des Moines, Ames, West Des Moines, Urbandale and Fort Dodge 712 1947 – Sioux City, Council Bluffs 641 2000 515 Marshalltown, Mason City, Ottumwa, Tama 563 2001 319 Davenport, Dubuque, Bettendorf, Clinton, Muscatine
See also